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SUBJECT: PhysicsPAPER NUMBER: IDATE: 1st September 2014TIME: 9:00 a.m. to 11:00 a.m.Answer all Questions.You are requested to show your working and to write the units where necessary.When necessary, take g, acceleration due to gravity, as 10m/s2.
Density
Pressure
Moments
Energy and Work
Force and Motion
Waves
Electricity
Electromagnetism
Heat
Radioactivity
Other equations
π r2
Vρm
ApF hgρp
distancelarperpendicuFMoment
hgmPE 2 vm21KE sFW
convertedenergyDoneWork tPE
forceunbalancedam gmW tauv
timetotaldistancetotalspeedaverage
2t v)(us
sa2uv 22 2 ta21u ts vmmomentum
mediuminlightofspeedairinlightofspeed
η λfv
depthapparentdepthreal
η distanceobjectdistanceimage
ionMagnificat
heightobjectheightimage
ionMagnificat f1T
tIQ RIV VQE
VIP A1R tVIE
321total RRRR 21total R
1R1
R1
sVpV
sNpN sIsVpIpV
ΔθcmQ
N ZA
hb)(a21 trapeziumaofArea
circleaofArea
hb21triangleaofArea
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1. The table below shows the tuning dial of a radio. The positions of some Maltese radio stationsare shown.MHz 89.7 92.7 93.7 100.2 101.0 101.8 102.3 103.0 103.7 104.6
Radiostation
BayRadio
OneRadio
RadioMalta
SolidFM
Radio101
CalypsoRadio
RadjuMarija RTK Campus
FMSmashRadio
a. With reference to the table above state which radio station transmits with:
i. the highest frequency ________________________;
ii. the longest wavelength_______________________.
(2 marks)b. Convert 93.7 MHz to Hz.
(1 mark)
c. Give two properties of radio waves which distinguish them from sound waves.
(2 marks)
d. Calculate the wavelength of Bay Radio waves.
(2 mark)
e. Complete the following sentences:
Radio waves form part of the ________________________ spectrum. Two other types of radiation
that are part of this spectrum are ________________________, ________________________.
(3 marks)
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2. A diver of mass 60 kg stands on the end of a diving board of mass 30 kg and length 2 m.
a. Draw, a simple diagram in the space below to show the forces acting on the diving board.(2 marks)
b. If the diver is 1.7 m away from the pivot calculate the total clockwise moment about the pivot.
3. Moyra cycles on her bike for 22.5 km as shown in graph below. At one point she has a punctureand repairs it on the spot to continue with her ride. The graph shows the different stages of herjourney.
Use the graph to find:
i. how far she travelled in the first 75 minutes; _____________________(1 mark)
ii. how long she took to travel the last 7.5 km of the journey; _____________________(1 mark)
iii. how long did Moyra take to repair the puncture. _____________________(1 mark)
Calculate:iv. her speed (in m/s) between the 175th and the 225th minute;
d. Would you expect the force mentioned in part (c) to, increase, decrease or remain the same if:
- a 5kg object is moved from the moon to planet Earth? ___________________________-- a 10kg object is taken on top of a very high mountain? ___________________________-- a 20kg object is taken from Valletta to Mosta? ___________________________
(3 marks)
e. Fill in the blanks with the most appropriate word.
The initial explosion which resulted in the formation and the expansion of the universe is called the
___________________________ ___________________________. With the use of
___________________________ we can observe the skies and understand how great our universe is.
Distances in space are measured in ___________________________
___________________________.
(3 marks)
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5. Carol and Edward investigate two surfaces A and B, which surround two beakers filled withwater as shown below. They design an experiment to find whether surface A or B is the betterabsorber of heat.
i. Name one precaution that they should take to ensure a fair result.
They tabulate the results obtained as shown below.
Time (min) 0 1 2 3 4 5 6 7
A (oC) 20 22 24 26 28 30 32 34
B (oC) 20 24 28 32 36 40 44 48
ii. Plot a graph of the temperature of A (y-axis) against time (x-axis). On the same graph plotalso the temperature of B (y-axis) against time (x-axis).
(5 marks)
iii. Which of the two materials (A or B) is the better absorber of heat? Explain.
6. A student is studying the relation between the angle of incidence and the angle of refraction of aray of light as it enters a particular glass block.
a. Mark on the diagram the angle of incidence and theangle of refraction at each boundary. Mark also thenormal at each boundary (3 marks)
b. List the procedure the student should follow tomeasure these angles.
(3 marks)
c The speed of light in air is 3 × 108 m/s whilst the speed of light in glass is 2 × 108 m/s. Calculatethe refractive index from air to glass.
(2 marks)
d. The table below shows how the angle of refraction, r varies with the angle of incidence, i.
Draw clearly a second graph for amedium with a much greaterrefractive index. Explain yourreasoning
(2 marks)
angle of refraction against angle of incidence
051015202530354045
0 20 40 60 80 100angle of incidence in degrees
angl
e of
refr
actio
n in
degr
ees
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8. Peter places equal volumes of a liquid in each of three containers A, B and C placed on a woodenbench as shown below.
i. Predict in which container A, B or C will the liquid evaporate at the fastest rate. Explain.
b. Lisa attached some loads to a spring. Each time she measured the new length of the spring usinga ruler. When she attached a load of 5 N the length of the spring extended to 42 cm. She thenadded another 5 N and the new length was 52 cm.
10.a A TV advertisement encourages car drivers to look outfor EU Tyre Labels before purchasing a tyre. Tyres arelabelled from ‘A’ to ‘G’. It is claimed that tyreslabelled ‘A’ reduce the fuel consumption of the car andincrease the car’s safety on the road.
i. Explain how car tyres which have a good grip on wetroads affect the braking distance of a car driver appliesa sudden brake.
MATRICULATION AND SECONDARY EDUCATION CERTIFICATE EXAMINATIONS BOARDUNIVERSITY OF MALTA, MSIDA
SECONDARY EDUCATION CERTIFICATE LEVEL
SEPTEMBER 2014 SESSION
SUBJECT: PhysicsPAPER NUMBER: IIBDATE: 1st September 2014TIME: 4:00 p.m. to 6:00 p.m.Answer all Questions.You are requested to show your working and to write the units where necessary.When necessary, take g, acceleration due to gravity, as 10m/s2.DensityPressure ApF hgρp
Moments distancelarperpendicuFMoment
Energy and WorkhgmPE 2 vm
21KE sFW
convertedenergyDoneWork tPE
Force and Motion
forceunbalancedam gmW tauv
timetotaldistancetotalspeedaverage
2t v)(us
sa2uv 22 2 ta21u ts vmmomentum
Waves
mediuminlightofspeedairinlightofspeed
η λfv
depthapparentdepthreal
η distanceobjectdistanceimage
ionMagnificat
heightobjectheightimage
ionMagnificat f1T
Electricity
tIQ RIV VQE
VIP A1R tVIE
321total RRRR 21total R
1R1
R1
ElectromagnetismsVpV
sNpN sIsVpIpV
Heat ΔθcmQ
Radioactivity N ZA
Other equationshb
21 triangleaofArea hb)(a
21 trapeziumaofArea
circleaofArea π r2
Vρm
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1. This question is about Radioactivity.
One method that scientists use to date ancient fossils is called carbondating. All living things on Earth are made up of a small amount ofthe element Carbon-14.
a. Carbon-14 ( ) decays by emitting beta particles. The symbol
for a beta particle is :
i. State the values of X and Y? X _____________________Y ______________________.
ii. A beta particle can be stopped by ____________________________________________.(3 marks)
b. Carbon-12 ( ) is another atom of the element Carbon. Carbon-12 and Carbon-14 are called
isotopes.
i. Isotopes have the same ___________________ number but different _________________
number.
ii. Carbon-14 is said to be radioactive. Its nucleus can be shown as __________________.(3 marks)
c. Apart from beta particles, radioactive nuclei can also emit:
i. ____________________ particles;
ii. _______________________ radiation.
(2 marks)
d. Compare the ionising power of the radioactive emissions mentioned in c (i) and c (ii).
e. A voltmeter is an instrument to measure potential difference.i. Draw the symbol of a voltmeter to show how it should be connected properly in Figure B to
find the voltage across bulb Q. (2 marks)
Figure A Figure B
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ii. What is the voltage across bulb Q in Figure B? Explain how you arrived to your answer.
f. Underline the correct term from the suggested words in the brackets.
i. If a third bulb R of resistance 4 , is connected in Figure A similarly to bulbs P and Q, the
voltage across bulbs P, Q and R will (increase, decrease, remain the same) and the current
through each bulb will (increase, decrease, remain the same).
ii. If a third bulb R of resistance 4 , is connected in Figure B in the same manner as bulb P and
Q, the voltage across bulbs P, Q and R will (increase, decrease, remain the same) and the
current through each bulb will (increase, decrease, remain the same).
(4 marks)
g. Which of following diagrams represent an electrical component which:
i. allows current to flow in one direction only? ____
ii. decreases its resistance when its temperature rises? ____
iii. allows more current to flow when exposed to light? ____(3 marks)
A B C D E
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shallow
3. This question is about water waves.
In a ripple tank experiment, an electric motor causes a bar to vibrate which then produces planewaves.
a. A block of perspex is placed at the bottom of the ripple tank such that there is a deep and ashallow section of water. Continue the path of the water waves in the shallower region. On yourdiagram show clearly the angle of incidence and the angle of refraction, and the wavelengths ofthe water waves in the shallower part. (4 marks)
b. The apparatus is rearranged and the water waves in thediagram could be observed.i. What do we call this phenomenon?
d. John and Rita wish to calculate the speed of the water waves at a particular moment.i. Describe a simple experiment on how can they find the speed of the water waves.
iv. Wavefronts were measured such that the distance between two successive crests was 2 cm.The frequency of the water waves is 0.5 Hz. Calculate the velocity of the water waves.
a. A skateboarder moves from A to B to C as shown on the diagram below.
i. If the skateboarder is 15 m high above the ground at A and the mass of the skateboarder is70 kg, calculate the potential energy of the skateboarder at A.
v. A second skateboarder has a smaller mass than the first skateboarder. If the secondskateboarder starts from the same height, how will the velocity at B change with respect tothe velocity of the first skateboarder? Explain.